JP2004064120A - Digital broadcast receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital broadcast receiver for providing a stable broadcast service even when a state of a transmission channel is fluctuated. <P>SOLUTION: The digital broadcast receiver 10 includes: a delay section 13 for delaying a received program signal; a switching section 16 for switching the program signal delayed by the delay section and the program signal not delayed; and a transmission channel state detection section 15 for detecting the state of the transmission channel at reception, and the switching section outputs one of the program signals on the basis of an output signal from the transmission channel state detection section. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a digital broadcast receiving apparatus, and more particularly, to a receiving apparatus for realizing stable provision of a broadcast service even when a transmission path state of a program signal fluctuates.
[0002]
[Prior art]
Conventionally, in digital broadcasting, a plurality of programs can be simultaneously transmitted and received as a program signal. On the transmitting side (broadcasting station), for example, multiplexing is performed using a multiplexing method of MPEG2 (Moving Picture Experts Group 2), which is one of the packet multiplexing methods, and the signal is transmitted to the receiving side (receiving device). The side separates the received multiplexed signal and provides a digital broadcast to a viewer. The multiplexing method of MPEG2 is standardized by ISO / IEC13818-1 (MPEG2 system).
[0003]
Here, the configuration of a conventional receiving apparatus will be described with reference to the drawings.
[0004]
FIG. 1 is a diagram illustrating a block configuration of an example of a conventional receiving apparatus.
[0005]
The receiving device 1 in FIG. 1 is configured to include an antenna device 2, a receiving unit 3, a separator 4, and a decoder 5.
[0006]
The receiving device 1 receives the broadcast wave including the program signal transmitted from the transmitting side by the antenna device 2, converts the broadcast wave into a transport stream (hereinafter, referred to as TS) by the receiving unit 3, and outputs to the separator 4 I do. The separator 4 obtains a video ES (Elementary Stream) in which the video signal is compression-coded and an audio ES in which the audio signal is compression-coded from the input TS, and outputs them to the decoder 5. The decoder 5 decodes the input video ES and outputs a video signal to an output unit such as a display. The audio ES also performs a decoding process and outputs an audio signal to an output unit such as a speaker. As a result, digital broadcasting is provided.
[0007]
[Problems to be solved by the invention]
However, in the conventional receiving apparatus, the transmission path state may fluctuate due to movement of the receiving apparatus or the like. In particular, when the transmission path state of the receiving apparatus deteriorates due to a broadcast wave being blocked by a building or the like, the program The video and audio are interrupted, or the video and audio stop. As a result, the service time rate decreases, and the viewer who views the program feels uncomfortable. Note that the service time rate indicates a percentage of time during which a broadcast wave can be received and viewed by a viewer. For example, when a broadcast wave is transmitted for 24 hours, the receiving apparatus can receive the broadcast wave. If the impossible state is 12 hours, the service time rate is 0.5.
[0008]
SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and outputs a video and / or an audio even when a transmission path condition of a broadcast wave is deteriorated, improves a service time rate, and furthermore, provides a stable broadcast service. It is an object of the present invention to provide a digital broadcast receiving apparatus capable of obtaining an effect of improving service to a viewer by providing the digital broadcast receiver.
[0009]
[Means for Solving the Problems]
In order to solve the above problems, the present invention employs means for solving the problems having the following features.
[0010]
The invention described in claim 1 is a digital broadcast receiving apparatus, wherein a delay unit that delays a received program signal, a switching unit that switches between the program signal delayed by the delay unit and a program signal that is not delayed. A transmission line state detection unit that detects a transmission state at the time of reception, wherein the switching unit outputs one program signal based on an output signal from the transmission line state detection unit. .
[0011]
According to the first aspect of the present invention, even when the state of the transmission path of the program signal is deteriorated, the alternative program signal can be output, so that the service time rate can be improved and the broadcast can be stabilized for the viewer. Service can be provided.
[0012]
According to a second aspect of the present invention, in a digital broadcast receiving apparatus, a transmission path state detection unit that detects a transmission state at the time of reception, and a video signal and / or an audio signal stored in advance in a received program signal. A video / audio insertion unit to be inserted, wherein the video / audio insertion unit converts the stored video signal and / or audio signal into the program signal based on an output signal from the transmission path state detection unit. It is characterized by being inserted.
[0013]
According to the second aspect of the present invention, when the transmission path condition is deteriorated for each receiving device, an alternative video and / or audio can be output, so that the discomfort and discomfort of the viewer can be reduced, and the broadcast can be reduced. Service can be improved.
[0014]
The invention described in claim 3 has an extraction unit that extracts delay time setting information from a received program signal, and the delay unit is configured to perform the following processing based on the delay time setting information extracted by the extraction unit. The delay time of the program signal is controlled.
[0015]
According to the third aspect of the present invention, the program signal can be easily delayed, and an appropriate delay time can be set according to the reception status of the receiving device.
[0016]
The invention described in claim 4 is characterized in that it has a display unit for displaying a transmission path state based on an output signal from the transmission path state detection unit.
[0017]
According to the fourth aspect of the present invention, it is possible for the viewer to easily grasp the state of the transmission path of the program signal. This can encourage the viewer to move the receiving device to a position where the transmission path condition becomes good when the transmission channel condition is poor.
[0018]
The invention described in claim 5 is characterized in that the transmission path state detection unit detects the transmission path state based on a cyclic counter included in each packet of a transport stream in digital broadcasting.
[0019]
According to the fifth aspect of the present invention, it is possible to easily detect the state of the transmission path of the program signal in the receiving device. Further, since the conventional transmission method can be used as it is, it is possible to efficiently detect the state of the transmission path.
[0020]
The invention described in claim 6 is characterized in that the transmission path state detection unit detects a transmission path state based on an error correction result of a transport stream in digital broadcasting or a state at the time of decoding.
[0021]
According to the invention described in claim 6, it is possible to easily detect the state of the transmission path of the program signal in the receiving device. Further, since the conventional transmission method can be used as it is, it is possible to efficiently detect the state of the transmission path.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention relates to a receiving apparatus for receiving a broadcast program, wherein while a transmission path state of a broadcast wave is deteriorating, the receiving apparatus receives the video and audio stored in the receiving apparatus in which the transmission path state is normal. When the transmission path state is restored to a normal state, the video and / or audio are switched and output according to the viewer's intention or a preset condition. As a result, even when the transmission path state of the receiving apparatus changes, the video and / or audio of the program can be viewed continuously, the service time rate can be improved, and stable services can be provided. it can.
[0023]
In addition, by giving an appropriate warning sound and / or warning display according to the state of the transmission path of the broadcast radio wave, it is possible to notify the viewer. Further, by calling the viewer's attention, for example, Can be instructed to move the receiving device, so that the receiving condition can be recovered early and stabilized. By improving the service time rate for the viewer by the means described above and providing a stable broadcasting service, the effect of improving the service to the viewer can be obtained.
[0024]
Next, an embodiment of the present invention will be described with reference to the drawings. The embodiments described below show one aspect of the present invention, and do not limit the present invention, and can be arbitrarily changed within the scope of the present invention.
[0025]
In the embodiments of the present specification, a receiving device for digital broadcasting conforming to the MPEG2 system will be described as an example. However, a receiving device of another similar broadcasting system can be similarly applied.
[0026]
FIG. 2 is a diagram showing a block configuration of an example of the first embodiment of the receiving device in the present invention.
[0027]
2 includes an antenna device 2, a receiving unit 3, a separator 11, an extracting unit 12, a delay unit 13, a decoder 14, a transmission line state detecting unit 15, and a switching unit 16. It is configured to have.
[0028]
First, the program signal transmitted from the transmitting side is received by the antenna device 2, converted into a TS by the receiving unit 3, and output to the separator 11. The separator 11 outputs the input TS to the extraction unit 12 and the transmission path state detection unit 15. Further, a correspondence table (PAT: Program Association Table) indicating programs multiplexed on the TSs obtained by multiplexing and demultiplexing the converted TSs, and what element signals each program is composed of, A correspondence table (PMT: Program Map Table) or the like indicating whether such address information (PID: Packet Identifier) is given is acquired.
[0029]
Thereafter, based on these pieces of information, a video ES (Elementary Stream) and an audio ES are obtained and output to the delay unit 13 and the decoder 14-2. The extracting unit 12 outputs, to the delay unit 13, delay time setting information in which a delay time from when the program signal is received to when the program signal is displayed is set based on text information or the like included in the input TS. The details of the delay time setting information will be described later.
[0030]
Next, the delay unit 13 acquires an appropriate delay time from the delay time setting information input from the extraction unit 12. Regarding the setting of the delay time, an appropriate delay time may be set in the delay unit 13 in advance. The delay unit 13 delays data according to the time set from the delay time setting information and the like and the bit rates of the input video ES and audio ES, and then outputs the data to the decoder 14-1.
[0031]
Here, the above-described delay time setting information will be described. The delay time setting information is, for example, when the same content is transmitted in a plurality of streams from a broadcast station (transmission) side, and when a receiver performs a time difference reproduction service that can acquire the content at a desired time, This is information necessary to output the content seamlessly.
[0032]
Here, an example of a method of acquiring the delay time setting information for outputting the above-described content without interruption will be described. First, there is a method of acquiring information (ESID, time difference, and the like) necessary for control from an information file encoded by text or binary, etc., transmitted using a data carousel. The data carousel transmission method will be described later.
[0033]
In other words, information necessary for obtaining the ESID and the time difference is encoded as text data or binary data, and transmitted as a part of the data content. (Equivalent) and transmit. In data broadcasting contents, one content is composed of a plurality of files. Therefore, similarly to the handling of files on a PC, a space called a name space is defined, and a position in the space is designated for each file to be transmitted. I do. The extracting unit 12 extracts a file of the delay time setting information requested by obtaining the position and outputs the file to the delay unit 13.
[0034]
For example, assuming that the position of the file in the name space is a file at a predetermined fixed position (for example, arib-dc: ///xxx.xxx.xxx.xxx/40/0000/diff.info) The unit 12 searches the file, and if the file exists, determines that the time-lag playback service is being performed, and outputs the content seamlessly based on the information described in the searched file. Is output to the delay unit 13. In addition, a method of acquiring the position of the data file indicated by the descriptor using the newly defined descriptor to acquire the position in the namespace of the file, and acquiring the data file can also be used. . In this case, the descriptor stored in the PMT or the like and transmitted at appropriate times is searched. If the descriptor exists, it is determined that the time difference reproduction service is being performed, and the name space described in the descriptor is used. The delay time setting information for outputting the content without interruption based on the transmitted information file is output to the delay unit 13.
[0035]
Here, the data carousel transmission method will be described. A data carousel is a service that repeatedly transmits still images, moving images, audio and characters, which are encoded by the respective encoding methods, and data corresponding to a procedure manual for reconstructing a screen by a receiving device. Yes, by using the data carousel transmission method, the transmitted data is stored in the receiving device, and the desired broadcast program stored on the receiving side at the time desired by the viewer in response to the viewer's viewing request. Can be broadcast, so that, for example, a broadcasting service such as weather or news at any time can be provided.
[0036]
Note that the data carousel transmission method is defined in “ARIB STD-B24 Part 2 and 3” and the like.
[0037]
As another method, there is a method of acquiring delay time setting information required for the above-described control using an event message transmission method. Here, the event message transmission system provides a means for transmitting message information from the transmitting side (broadcasting station) to an application operating on the receiving device immediately or at a specified time. It is specified in "ARIB STD-B24 Vol. 3".
[0038]
First, an event message having a predetermined ESID and message ID is acquired, and upon receiving the event message, the extraction unit 12 performs an operation based on information described in “private_data_byte”.
[0039]
Here, the ESID is “component_tag” and is stored in the PMT. By reading the PMT of the program, the extraction unit 12 can know whether or not an event message of a predetermined “component_tag” has been transmitted, and if so, receives the event message. You can wait.
[0040]
The message ID is an ID added to the event message and transmitted, and distinguishes the event message transmitted by the same “component_tag” (upper byte: “event_msg_group_id”, lower byte: “Event_msg_id”).
[0041]
Upon receiving an event message having a predetermined message ID, the extraction unit 12 acquires “private_data_byte” included in the event message. Based on the information described in the obtained “private_data_byte”, it is possible to extract the parameters of the data to be transmitted with delay. This parameter is output to the delay unit 13 as delay time setting information.
[0042]
Furthermore, as another method, there is a method of acquiring information necessary for control from a descriptor of the MPEG2 system. In this method, when the extraction unit 12 detects a newly defined descriptor in the PMT, it determines that the service is being performed, and based on the information described in the descriptor, the content is determined. Is output to the delay unit 13 for outputting the data seamlessly.
[0043]
In addition, when the time difference reproduction service as described above is not performed, or when other contents are complementarily reproduced according to the preference of the receiver (viewer), the delay time to be delayed by the delay unit 13 is arbitrarily set. can do.
[0044]
Next, the decoder 14 will be described. The decoder 14-1 and the decoder 14-2 decode the video ES and the audio ES and output the decoded video ES and the audio ES to the switch 16. The decoder 14-1 and the decoder 14-2 may be the same type of decoder or different types of decoders. For example, when decoding an audio ES, an AAC decoder decodes a compressed audio signal generated by AAC and converts it into audio data. Here, AAC (Advanced Audio Coding) is an audio coding system that is an international standard as ISO / IEC13818-7. It should be noted that, in addition to AAC, service is provided at a very low bit rate, for example, by using CELP (Code Excited Linear Prediction) or MIDI (Musical Instrument Digital Interface) instead of deteriorating quality. Can be provided.
[0045]
Next, the operation of the transmission path state detector 15 will be described. In a transmission path coding method such as digital broadcasting, a TS defined by the MPEG2 system is used as an input signal, a transport stream packet (hereinafter, referred to as TSP), and a Reed-Solomon code (for example, in the case of terrestrial digital broadcasting) as an error correction method. Perform encoding with RS (204, 188)). Therefore, in order to detect the transmission path state by the transmission path state detecting unit 15, the transmission path state can be detected by monitoring the state of the field of the TSP defined in the MPEG2 system.
[0046]
That is, in the TSP field, when the value of “continuity_counter” is discontinuous, it is known that the TSP is missing for some reason. Can be detected. Further, in the “transport_error_indicator”, for example, when the reception apparatus 10 is provided with a Reed-Solomon decoder and the received program signal is corrected for errors, if the error in the TSP cannot be corrected, the “transport_error_indicator” is used. 1 is set. Therefore, the transmission path state detection unit 15 can detect the transmission path state as deteriorating when the transmission path state is degraded when 1 is set with reference to “transport_error_indicator”.
[0047]
Further, as another method, in the case of terrestrial digital broadcasting, for example, in the case of terrestrial digital broadcasting, the frame synchronization of OFDM (Orthogonal Frequency Division Multiplexing) signal is monitored. Can be determined. As a method of synchronizing the frame of the OFDM signal, for example, there is a method of obtaining a guard interval correlation. If this correlation cannot be obtained, the signal cannot be demodulated without synchronization.
[0048]
Further, as another method, there is a method of monitoring a TS reception buffer. This is because if the transmission path condition is poor and decoding to the TSP is not possible, an underflow occurs in the reception buffer of the MPEG2TS decoder. Conversely, if an underflow occurs, the transmission path state detection unit 15 Can be detected as having deteriorated.
[0049]
Further, as another method for detecting the state of the transmission path, there is a method of outputting an output signal in accordance with the electric field intensity using a device for measuring electric field intensity, an IC (integrated circuit), or the like.
[0050]
Next, the switch 16 switches the output of the video signal and the audio signal based on the output signal from the transmission path state detector 15 and outputs the output to the output unit. In a simple case, an analog switch, a mixer or the like can be used. Note that the output unit can be a transmission unit when transmitting to another point and a display unit when displaying, and various changes can be made within the scope of the invention.
[0051]
As described above, if the transmitting side (broadcasting station) provides a service that transmits the same content with a certain time difference, even if the receiving device is in the shadow of the broadcast radio wave due to the movement or the like, continuous operation is performed. And output the content.
[0052]
Further, for example, when receiving a program service in an environment in which the transmission path conditions fluctuate, the receiving unit 3 has a delay unit 13 or a decoder 14 for simultaneously receiving a plurality of streams, and the delay unit 13 or the decoder 14 By having a storage function for one or more sets of streams among a plurality of streams, it is possible to arbitrarily switch and output (play) streams output from the plurality of streams under a fluctuating transmission path condition.
[0053]
In addition, programs other than the program desired by the viewer can be stored, and output in place of the case where the reception state of the program signal related to the desired program deteriorates. This makes it possible to continuously provide a broadcast service even when the transmission path condition fluctuates, and it is possible to obtain an effect of improving the broadcast service for the viewer.
Next, a second embodiment of the receiving apparatus according to the present invention will be described with reference to the drawings. FIG. 3 is a diagram showing a block configuration of an example of the second embodiment of the receiving device in the present invention.
[0054]
3 includes an antenna device 2, a receiving unit 3, a separator 11, an extracting unit 12, a delay unit 13, a decoder 14-1, a transmission line state detecting unit 15, a switching unit 16 It is comprised so that it may have.
[0055]
First, a program signal is received by the antenna device 2, converted into a TS by the receiving unit 3, and output to the separator 11. The separator 11 outputs the input TS to the extraction unit 12 and the transmission path state detection unit 15. The demultiplexing unit 11 demultiplexes the received signal and outputs the video ES and the audio ES to the delay unit 13 and the switch 16. The extraction unit 12 outputs the delay time setting information extracted from the input TS to the delay unit 13 as described above. The delay unit 13 delays the input video ES and audio ES based on the delay time setting information input from the separator 11 and outputs the delayed video ES and audio ES to the switching unit 16.
[0056]
Further, as described above, the transmission path state detection unit 15 detects the transmission path state from the input TS, and outputs an output signal based on the detection to the switching unit 16.
[0057]
The switching unit 16 switches the video ES and the audio ES based on the output signal from the transmission path state detection unit 15 and outputs the video ES and the audio ES to the decoder 14-1. The decoder 14-1 decodes the video ES and the audio ES from the switch 16 to generate a video signal and an audio signal, and outputs the video signal and the audio signal to output units such as a display and a speaker. Thus, the same effect as in the first embodiment can be obtained with a reduced device configuration.
[0058]
Next, a third embodiment of the receiving apparatus according to the present invention will be described with reference to the drawings. FIG. 4 is a diagram showing a block configuration of an example of the third embodiment of the receiving device in the present invention.
[0059]
4 is configured to include the antenna device 2, the receiving unit 3, the separator 11, the decoder 14-1, the transmission path state detecting unit 15, and the video / audio inserting unit 31. I have.
[0060]
First, a program signal is received by the antenna device 2, converted into a TS by the receiving unit 3, and output to the separator 11. The demultiplexer 11 outputs the input TS to the transmission path state detection unit 15, demultiplexes the received signal, and outputs the video ES and / or the audio ES to the decoder 14-1.
[0061]
The transmission path state detection unit 15 can detect the transmission path state of the content by using the TS similarly to the above-described embodiment, and outputs an output signal of the detection result to the video / audio insertion unit 31. The decoder 14-1 decodes the video ES and the audio ES to generate a video signal and an audio signal. The generated video signal and audio signal are output to the video / audio insertion unit 31.
[0062]
The video / audio insertion unit 31 stores images, various videos, music, or various sound sources, and outputs images, videos, noises, voice messages, music, silence, and the like based on an output signal from the transmission path state detection unit 15. According to the setting of the device or the output method set in advance by the viewer in the receiving device, the video signal or the audio signal is inserted and output. By using the video / audio inserter 31, it is possible to reduce discomfort and discomfort caused by the deterioration of the transmission path state of the viewer. For example, when the transmission path condition deteriorates, the video can be stopped and a preset sound (music) can be output. In addition, the viewer can be notified of the reception state of the transmission path of the receiving device by voice, and the viewer can easily grasp the reception state.
[0063]
According to the third embodiment of the present invention described above, the receiver can be moved to a place where the transmission path condition is good for the viewer (receiver).
[0064]
The method of notifying the viewer is not limited to the method described above. For example, the notification may be performed by a display device or a vibration.
[0065]
Next, a fourth embodiment of the receiving apparatus according to the present invention will be described with reference to the drawings. FIG. 5 is a diagram illustrating a block configuration of an example of a fourth embodiment of the receiving device according to the present invention.
[0066]
The receiving device 40 in FIG. 5 is configured to include the antenna device 2, the receiving unit 3, the separator 11, the decoder 14-1, the transmission path state detecting unit 15, and the display device 41.
[0067]
As shown in FIG. 5, by installing the display device 41 so that the output of the transmission line state detection unit 15 can be input, the state of the transmission line can be displayed and the viewer can be notified. Note that the video ES and the audio ES output from the separator 11 to the decoder 14-1 are output to the output unit as they are after being decoded into a video signal and an audio signal. Note that the operations of the antenna device 2, the receiving unit 3, the separator 11, and the decoder 14-1 are the same as those of the above-described receiving device 30, and a description thereof will be omitted.
[0068]
In addition, as a display method of the display device 41, for example, a warning such as an insufficient electric field strength is displayed using an LED, a liquid crystal display, or the like, so as to prompt a viewer (receiver) to move to a position. Can be. Note that the notification means for the viewer is not limited to the above. For example, a vibration motor or the like may be provided to notify the viewer of the reception state.
[0069]
As described above, according to the fourth embodiment of the present invention, it is possible to notify the receiver of the reception status by an appropriate method under the fluctuating reception status.
[0070]
As described above, by having the receiving device of the present invention, it is possible to continuously provide a broadcast service even in a place where the state of the transmission path changes. For example, when the broadcasting station performs a service of sending the same content with a certain time difference, the broadcast radio wave can be output continuously even in a state where the transmission path condition is deteriorated due to a shadow of a building or the like. . Further, when the transmission path condition is deteriorated, a counter program or the like can be output, so that the effect of improving the service to the viewer can be obtained.
[0071]
Further, it is possible to provide a receiving device that gives a sense of security and reduces a sense of discomfort and discomfort of the viewer by outputting a substitute sound even when the electric field strength is insufficient. Further, by notifying the receiver of the state of the transmission path, the receiver can be moved to a state in which the radio wave condition is better, so that the reception service time rate to the receiver can be improved.
[0072]
Note that the above-described contents can be handled by each receiving apparatus that receives a broadcast wave, so that the transmitting side can obtain the effect of improving the service to the viewer only by using the conventional transmitting method. .
[0073]
【The invention's effect】
As described above, according to the present invention, it is possible to continuously provide a broadcast service even when the transmission path condition changes. Thereby, the effect of improving the service to the viewer can be obtained.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a block configuration of an example of a conventional receiving apparatus.
FIG. 2 is a diagram illustrating a block configuration of an example of a first embodiment of a receiving device according to the present invention.
FIG. 3 is a diagram illustrating a block configuration of an example of a second embodiment of a receiving device according to the present invention.
FIG. 4 is a diagram illustrating a block configuration of an example of a third embodiment of a receiving device according to the present invention.
FIG. 5 is a diagram illustrating a block configuration of an example of a fourth embodiment of a receiving device according to the present invention.
[Explanation of symbols]
1,10,20,30,40 Receiver
2 Antenna device
3 Receiver
4,11 separator
5,14 decoder
12 Extraction unit
13 Delay section
15 Transmission line state detector
16 Switch
31 Video / Audio Insertion Unit
41 Display device

Claims (6)

In a digital broadcast receiving device,
A delay unit for delaying a received program signal;
A switching unit that switches between a program signal delayed by the delay unit and a program signal that is not delayed,
Having a transmission path state detection unit that detects a transmission path state at the time of reception,
The receiving device, wherein the switching unit outputs one of the program signals based on an output signal from the transmission path state detecting unit. In a digital broadcast receiving device,
A transmission path state detection unit that detects a transmission state at the time of reception;
A video / audio insertion unit for inserting a video signal and / or an audio signal stored in advance into a received program signal,
The video / audio insertion unit inserts the stored video signal and / or audio signal into the program signal based on an output signal from the transmission path state detection unit. Having an extraction unit for extracting delay time setting information from the received program signal,
The receiving device according to claim 1, wherein the delay unit controls a delay time of the program signal based on the delay time setting information extracted by the extraction unit. The receiving apparatus according to claim 1, further comprising a display unit that displays a transmission state based on an output signal from the transmission path state detection unit. The transmission path state detection unit,
3. The receiving apparatus according to claim 1, wherein a transmission path state is detected based on a cyclic counter included in each packet of a transport stream in digital broadcasting. The transmission path state detection unit,
3. The receiving apparatus according to claim 1, wherein a transmission path state is detected based on an error correction result of a transport stream in digital broadcasting or a state at the time of decoding.

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